Thank you. I think longitudinal surveys are not controlled experiments, therefore conclusions draw from them are not causal.
I have another question about fixed effects models. I was once told by an economist that to use fixed effects models, you need to have at least four waves of data. I haven't been able to find any literature supporting that, but wonder if it is true. Thank you.
I have another question about fixed effects models. I was once told by an economist that to use fixed effects models, you need to have at least four waves of data. I haven't been able to find any literature supporting that, but wonder if it is true. Thank you.
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